Name: MEAN WELL N78 series: Non-isolated DC-DC regulator for positive output - N7812-1PH
Brand: MEAN WELL
SKU: N7812-1PH
Price: 12.32 USD
Availability: InStock

MEAN WELL N78 series: Non-isolated DC-DC regulator for positive output - N7812-1PH

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Description

N7812-1PH — Non-isolated DC-DC switching regulator for positive output

MEAN WELL N7812-1PH is a non-isolated DC-DC switching regulator for a positive 12 V output application, with output-current magnitude up to 1000 mA. This open-frame PCB type for horizontal mounting operates from 16–36 V DC. Connect it using the specified positive-output pin assignment and observe the load and temperature limits below.

Download MEAN WELL N78 Datasheet (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

Model section: datasheet PDF pages 1–8. Follow the table and connection drawing for this output application.

Model and output application

Manufacturer model	N7812-1PH
Output application	Positive output: 12 V
Package and model code	PH: open-frame PCB type for horizontal mounting. The 1A designation identifies the series; the selected application current below is the applicable limit.
Other output applications	The same ordering code also has a negative application at −12 V, with 8–20 V DC input and a 300 mA output-current magnitude limit. Use the corresponding pin assignment. One module does not provide both output rails simultaneously.
Typical uses	Voltage step-down, point-of-load regulation in distributed power systems, industrial PCs, digital set-top boxes, data communications and microcontroller circuits. Pin-out compatibility with LM78xx/LM79xx linear regulators is specified; verify the chosen polarity, pin orientation and operating limits before substitution.

Electrical specifications

Input voltage	16–36 V DC; catalogue normal input: 24 V DC.
Input current	No load: 10 mA; full load: 780 mA.
Output voltage	12 V DC in the selected application.
Output current range	0–1000 mA for this application.
Calculated output power	12 W, calculated from the selected output-voltage magnitude and maximum output-current magnitude; subject to the stated input, load and temperature limits. This is a calculation from the application table, not a separately specified power rating.
Series power range	3.3–15 W is the series-wide catalogue range. Use this application’s output voltage, current and derating limits; the series upper value is not a rating for every model or polarity.
Series capability reference	The N78 series offers efficiency up to 96% and input capability up to 36 V DC across its models and applications. Use the selected application's efficiency, input range, load and temperature limits stated here; these series maxima are not individual ratings.
Efficiency	95.5% typical; use the general test conditions below.
Maximum capacitive load	220 µF.
Voltage accuracy	±3.0% maximum.
Ripple and noise	100 mVp-p maximum; measured at 20 MHz bandwidth with a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors connected in parallel.
Line regulation	±0.3%; measured from low to high input voltage at rated load.
Load regulation	±0.4%; measured from 0% to 100% rated load.
Switching frequency	500 kHz typical.
Internal power dissipation	500 mW as listed in the specification.
General test conditions	Normal input, rated load, 25°C ambient and 70% RH unless a particular parameter states another condition. The input-current no-load column retains its stated no-load condition.

Protection and operating conditions

Input filter and fuse	Capacitor input filter. An external 1500 mA slow-blow input fuse is recommended for all models in this series.
Input surge voltage	40 V maximum for 100 ms maximum; this transient limit does not extend the continuous input-voltage range.
Short-circuit protection	Continuous short-circuit protection; automatic recovery after the short-circuit condition is removed.
Overload protection	200–300% as specified; recovers automatically after the fault condition is removed.
Overtemperature protection	Shuts down the output voltage; automatic recovery after the unit cools.
Cooling and load derating	Free-air / natural convection; no additional heatsink is required within the specified operating and load limits. The curve permits 100% load from −40°C through +71°C, then derates to 70% at +85°C. Follow the intervening curve.
Operating and case temperature	Ambient −40 to +85°C subject to derating; case temperature +110°C maximum.
Humidity and storage	Operating humidity: 5–95% RH, non-condensing. Storage: −55 to +125°C and 10–95% RH, non-condensing.
Temperature coefficient	0.03%/°C over 0–71°C.
Soldering temperature	265°C maximum for 3–5 seconds, measured 1.5 mm from the case.
Vibration	10–500 Hz, 2 G; 10 minutes per cycle, for 60 minutes along each X, Y and Z axis.

Dimensions and connection

Dimensions	Open-frame body: 10.5 × 7.5 × 16 mm (L × W × H); the mechanical side view marks 7.50 mm maximum depth.
Mechanical drawing details	PH horizontal drawing: 4.3 mm horizontal lead projection and 2.54 mm pin pitch. Pins are 0.64 × 0.64 mm, ±0.1 mm; general dimensional tolerance ±0.5 mm.
PCB / connection orientation	Top-view footprint uses a 2.54 mm grid and Ø1 mm holes (+0.2/−0). The illustrated left-to-right pin order is 1, 2, 3; identify the pin-1 mark and follow the PH drawing.
Pin assignment	Pin 1: +Vin; pin 2: GND; pin 3: +Vout. This is the positive-output application pin assignment.

Typical application and installation

External capacitors	The typical application table specifies MLCC capacitors: input Ci = 10 µF / 50 V; output Co = 22 µF / 25 V.
Application circuit connections	In the positive application, the output capacitor connects between pin 3 (+Vout) and pin 2 (GND). The schematic marks its positive side at +Vout. The input capacitor connects between +Vin and GND.
Combined positive and negative rails	The illustrated combined application uses two separate modules, one wired for positive output and one for negative output, with a common ground. Select an input voltage valid for both applications. A 10 µH LDM component is recommended in the negative-module input branch to reduce interference; the diagram does not establish same-rail current sharing.
Accessories and assembly	No dedicated accessory ordering code is specified in this series datasheet. External fuses, capacitors and the application-dependent inductor are circuit components selected for the system, not stated as items supplied with the regulator.

Compliance, reliability and packing

Isolation and safety	Non-isolated input/output. EAC TP TC 020/2011 approved as listed in the catalogue.
EMC emission	BS EN/EN55032 (CISPR32): conducted emission is listed as N/A; radiated Class B is specified without additional EMC components. Observe the application-circuit and input-capacitor requirements and verify the completed system.
EMC immunity	BS EN/EN61000-4-2: Level 2, ±4 kV contact ESD; BS EN/EN61000-4-3: Level 2, 3 V/m; BS EN/EN61000-4-4: Level 1, 0.5 kV; BS EN/EN61000-4-5: Level 1, 0.5 kV line-to-line; BS EN/EN61000-4-6: Level 2, 3 V (e.m.f.).
MTBF	1800 K hours, MIL-HDBK-217F at 25°C.
Construction	Open-frame PCB construction; the series plastic-case specification does not make the PV/PH open frame a cased package.
Single-unit weight reference	2 g, catalog packing reference per unit; not a measured net-weight or parcel-weight claim.
Standard packing	150 pieces per box / 395 g box gross weight; 1,800 pieces per carton (12 boxes) / 6.2 kg carton gross weight. Antistatic-foam box: 220 × 195 × 45 mm. Standard carton: 620 × 230 × 230 mm. These are manufacturer bulk-packing references, not a statement of the quantity included with an individual purchase.
Manufacturer warranty	3 years as stated in the series datasheet.

System installation and EMC

Complete-system EMC verification	Verify EMC with the regulator installed in the final equipment and connected to a representative load. Wiring, assembly and the application affect the result. Follow the model's specified EMC conditions and any required external components; the linked EMI testing guidance does not certify the finished equipment.